tldr practical advice for google: If you use resque 3.6.0 or less, and Rails 7.1, and are getting an error: cannot load such file -- rack/showexceptions -- you probably need to add rack "~> 2.0" to your Gemfile! The latest version of the ruby gem sinatra, as I write this, is 3.1.0, and it does…

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A recent update to Rails 7.1 introduced a compatibility issue with the sinatra gem and rack 3.x. The article discusses the problem of open-ended gem dependencies and suggests a solution to resolve the issue. It also highlights the potential risks of not specifying upper bounds for gem versions.

Beware sinatra, rails 7.1, rack 3, resque bundler dependency resolution – Bibliographic Wilderness